The majority of the diseases which overtake man also overtake the animal, but the animal is not cured by drugs. In the mountains, as in the wilderness, the animal’s physician is the power of taste and smell. The sick animal smells the plants that grow in the wilderness; he eats those that are sweet and fragrant to his smell and taste, and is cured. The cause of his healing is this. When the sugar ingredient has become diminished in his constitution, he begins to long for sweet things; therefore, he eats an herb with a sweet taste, for nature urges and guides him; its smell and taste please him, and he eats it. The sugar ingredient in his nature will be increased, and health will be restored.
It is, therefore, evident that it is possible to cure by foods, aliments and fruits; but as today the science of medicine is imperfect, this fact is not yet fully grasped. When the science of medicine reaches perfection, treatment will be given by foods, aliments, fragrant fruits and vegetables, and by various waters, hot and cold in temperature.
This discourse is brief; but, if God wills, at another time, when the occasion is suitable, this question will be more fully explained.
The true explanation of this subject is very difficult. Know that beings are of two kinds: material and spiritual, those perceptible to the senses and those intellectual.
Things which are sensible are those which are perceived by the five exterior senses; thus those outward existences which the eyes see are called sensible. Intellectual things are those which have no outward existence but are conceptions of the mind. For example, mind itself is an intellectual thing which has no outward existence. All man’s characteristics and qualities form an intellectual existence and are not sensible.
Briefly, the intellectual realities, such as all the qualities and admirable perfections of man, are purely good, and exist. Evil is simply their nonexistence. So ignorance is the want of knowledge; error is the want of guidance; forgetfulness is the want of memory; stupidity is the want of good sense. All these things have no real existence.
In the same way, the sensible realities are absolutely good, and evil is due to their nonexistence—that is to say, blindness is the want of sight, deafness is the want of hearing, poverty is the want of wealth, illness is the want of health, death is the want of life, and weakness is the want of strength.